Apparatus for trimming both edges of a multilayer paper web

ABSTRACT

THE PRESENT INVENTION RELATES TO AN IMPROVEMENT OF A PAPER-MAKING APPARATUS FOR MAKING PILED PAPER BY MEANS OF PLURAL CYLINDERS FOR MAKING PAPER, AND PROVIDES SUCH CHARACTERISTICS THAT THE PILED PAPER, WHICH IS MADE INTO SHEET AND HELD AND DEHYDRATED BETWEEN FELT BELTS, IS IMMEDIATELY CONVEYED TO AN EDGE-CUTTING ROLL WITHOUT BEING REMOVED FROM THE FELT BELT IN CONTRACT WITH THE ROLL AND BOTH EDGES OF THE PILED PAPER ARE CUT AND ARRANGED STRAIGHTLY BY WATER JETS. ON THE CUTTING ROLL ARE FORMED PERIPHERAL GROOVES IN THE NEIGHBORHOOD OF BOTH ENDS OF THE OUTER PERIPHERY THEREOF, AND THE WATER JET NOZZLES SPRAY INTO THESE PERIPHERAL GROOVES. THUS, WHILE THE PILED PAPER IS IN CONTACT WITH THE CUTTING ROLL, BOTH EDGES THEREOF ARE TRIMMED. THUS, THE PILED PAPER IS ALWAYS IN CONTACT WITH THE FELT BELT UNTIL IT IS CONVEYED TO THE CUTTING ROLL AND BOTH OF ITS EDGES ARE TRIMMED SO THAT THERE PROVIDED SUCH EFFECT THAT THE PAPER IS PREVENTED FROM BREAKING EVEN IN THE PILED STATE WHICH IS NORMALLY SUSCEPTIBLE TO DAMAGE.

Jan. 19, 1971- KEIJI MIYAMOTO 3,556,936

APPARATUS FOR TRIMMING BOTH EDGES OF A MULTILAYER PAPER WEB Filed Feb. 23, 1968 2 Sheets-Sheet 1 I m ,0 x V 3 1971 KEIJI MIYAMOTO 3,556,935

APPARATUS FOR TRIMM'ING BOTH EDGES OF A MULTiLAYER PAPER WEB Filed Feb. 25, 1968 2 Sheets-Sheet 2 M: (M NH emote United States Patent 3,556,936 APPARATUS FOR TRIMMING BOTH EDGES OF A MULTILAYER PAPER WEB Keiji Miyamoto, Nishinomiya, Japan, assignor to Shizuoka Kogyo Kabushiki Kaisha, also known as Shizuoka Kogyo Co., Ltd., Fujimi, Japan Filed Feb. 23, 1968, Ser. No. 708,480 Claims priority, application Japan, Nov. 25, 1967, 42/ 76,287 Int. Cl. D2lf 7/00 U.S. Cl. 162-272 4 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to an improvement of a paper-making apparatus for making piled paper by means of plural cylinders for making paper, and provides such characteristics that the piled paper, which is made into sheet and held and dehydrated between felt belts, is immediately conveyed to an edge-cutting roll without being removed from the felt belt in contact with the roll and both edges of the piled paper are cut and arranged straightly by water jets. On the cutting roll are formed peripheral grooves in the neighborhood of both ends of the outer periphery thereof, and the water jet nozzles spray into these peripheral grooves. Thus, while the piled paper is in contact with the cutting roll, both edges thereof are trimmed. Thus, the piled paper is al ways in contact with the felt belt until it is conveyed 'to the cutting roll and both of its edges are trimmed so that there is provided such effect that the paper is prevented from breaking even in the piled state which .is normally susceptible to damage.

The present invention relates to an improvement in a paper-making machine for making sheet paper, that is, an addition of a device, which cuts both sides of the piled or multilayer paper straightly, and an arrangement of a suction roll, a press roll and a cutting roll for cutting the sides.

The piled paper, which is made by a paper-making aparatus, contains a large amount of water, so that it is susceptible to be broken, especially when the sides are irregular, and such irregular portions are not uniform in thickness.

The present invention provides a device whereby such paper-breaking is prevented. Both edges of the piled paper are cut and arranged straightly. The device in detail will be clarified by illustration of the preferred embodiment according to the present invention as shown in the accompanying drawings.

FIG. 1 is a side view of a paper-making apparatus according to the present invention.

FIG. 2 is a partially enlarged side view showing a principle part of the same.

FIG. 3 is an elevation view of the same.

FIG. 4 is a partially enlarged side view showing a second embodiment of the paper-making apparatus ac cording to the present invention.

FIG. 5 is a side view of the conventional papermaking apparatus.

Now, referring to the usual paper-making apparatus shown in FIG. 5, are plural paper-making cylinders, and the lower parts of each cylinder 21 are inserted into vats 22, in which raw material for making paper is contained. Numeral 23 is an endless felt belt, supported by suitable supporting rolls 24. The lower side of belt 23 travels in contact with cylinders 21. By such travelling, raw material from vats 22 is transferred by the cylinders 21 and adhered to the surface of the felt belt 23 in the form of a paper sheet. The sheet is held between the endless felt belts 23 and 26 and dehydrated by means of suitable suction rolls or the like. Then, the piled paper a is separated from the felt belts 23 and 26 and travels into subsequent dehydrating and drying apparatus. But, the conventional apparatus has no device which cuts both edges before the piled paper a is separated from the felts 23 and 26 and dried, so that the edges are irregular and the thicknes is not uniform. Consequently, breaking of the paper sheet occurs easily.

Next, illustrating the embodiment according to the present invention, shown in FIGS. 1, 2 and 3, 1 are cylinders for making paper, and 2 are vats containing raw material for making paper. Numeral 3 is an endless felt belt supported suitably by means of supporting rolls 4, and the lower side of the belt is in contact with each cylinder 1.

Numeral 6 is an endless felt belt positioned above belt 3 and supported by means of supporting rolls 7, and 5 and 5' are upper and lower rolls arranged inside the felt belts 6 and 3 respectively. Roll 5 is located at the upper and terminal portion of the path of travel of the felt belt 3. Upper and lower rolls 5 and 5' are porous and contain suction apparatus for withdrawing water from the piled paper b held between felt belts 6 and 3. Each felt belt 3 and 6 includes well-known cleaning apparatus (not shown).

When the felt belts 3 and 6 are moved in the direction shown by the arrows in FIG. 1, the raw material contained in the vat 2 is transferred by cylinders 1 and adhered to the felt belt 3 in piled sheet form. When the piled paper b reaches rolls 5 and 5', the water therein is dehydrated and sucked through the felt belts 3 and 6 by rolls 5 and 5'. Such process is similar to that in the conventional paper-making apparatus. It is to be understood that rolls 5 and 5' may be used merely as press rolls and that a suction roll may be arranged at another position.

The present invention contains an edge-cutting roll 8 being in contact with the roll 5 in the above-mentioned apparatus. Roll 8 is positioned such that the piled paper b is separated from the felt belt 3 of the roll 5 and is in contact with only the felt belt 6 of the roll 5 and is then conveyed by the felt belt 6 to the roll 8 at the position where the felt belt 6 is in contact with the roll 5.

Said roll 8 has grooves at the outer periphery near both ends thereof as shown in FIG. 3. A pair of right and left water jet nozzles 10, located in the neighborhood of both ends of the roll 8 are set to jet against peripheral grooves 9.

The piled paper b, which was separated from the felt belt 6 and conveyed to the roll 8, is forced to pass under the nozzles 10.

Further, at the outer periphery of the roll 8 are mounted a doctor 11 for scraping the piled paper b from the roll 8 and doctors 12, which are fitted into the peripheral grooves 9 to clean the inside thereof. Below the roll 8 is placed a receiving bath 13.

In the apparatus mentioned above, the incompletely dry piled paper b, which was dehydrated by the rolls 5 and 5' and separated from the felt belt 3 is conveyed immediately fro-m the roll 5 to the cutting roll 8 without being separated from the felt belt 6.

Due to water jets from the nozzles 10 to the peripheral grooves located at both ends of cutting roll 8, both edges of the piled paper b conveyed on the roll 8 are trimmed by force of the jet water, and the trimmed pieces drop down with the water into receiving bath 13. Then, the piled paper b, both edges of which are trimmed, is moved to the next dehydrating and drying apparatus 14.

Thus, in the present invention the piled paper b is scraped from the felt belt 3 and is conveyed to the cutting roll 8 without being removed from roll 5 and the felt belt 6. The irregular part of both edges of piled paper b is trimmed at roll 8. Therefore, breaking of the paper while the piled paper b is conveyed to the drying apparatus or separated from the cutting roll 8 can be prevented.

In the second embodiment, shown in FIG. 4, the piled paper b is manufactured similarly to the example shown in FIG. land passes between press rolls 15 and 15' on felt belts 3 and 6. And, immediately after the felt belt 6 passes the press roll 15, it is separated from the piled paper b.

The edge-cutting roll 8 is located above a roll 8' at the upper and terminal portion of the path of travel of the lower felt belt 3. Filed paper b is conveyed together with the felt belt 3 to rolls 8 and 8 and reaches roll 8 without being separated from roll 8'. Filed paper bis conveyed to a drying apparatus through a guide roll 16 mounted above roll 8. In such case, the nozzles 10 jet water toward grooves 9 of the roll 8 against the bottom of the piled paper b which travels upwardly.

Scraping doctor 11 is also mounted at the upper side of the roll 8. As in the first embodiment roll 8' is used as a suction roll and as a press roll.

In the embodiment mentioned above, both edges of the piled paper b on the roll 8 are trimmed 'by action of the water jets from nozzles 10. Consequently, the elfect obtained by such action is completely similar to that in the first embodiment.

Thus, as shown in the embodiment of FIGS. 1 and 2, at the upper portion between the cutting roll 8 and the roll 5', which scrapes the felt belt 3 from the piled paper, is mounted the roll 5, which is in contact with the rolls 5' and 8 respectively. Around roll 5 is set the upper felt belt 6 in such manner that said felt belt 6, the piled paper b and the'felt belt 3 are held between the rolls 5 and 5'. Then the felt belt 6 and the piled paper b scraped from the felt belt 3 are held between the roll 5 and the cutting roll 8. Further, the piled paper b is never separated from the felt belt 6 between the rolls 5 and 8, so that the piled paper b can be transported on the cutting roll 8 without being removed from the felt belt 6. Therefore, the edges of the piled paper b are trimmed before transfer to subsequent apparatus, with the result that breakage is eliminated. Also, it is exceedingly easy to treat the water used for cutting the edges and the trimmed paper.

What I claim is:

1. An apparatus for trimming both edges of a multi layer paper web adapted to be used in a paper making machine, comprising a plurality of paper-making cylinders; a pair of endless felt belts, upper and lower, which carry the paper made by said paper-making cylinders by holding it therebetween; a pair of upper and lower Suction rolls revolving in contact with the inside of said upper and lower endless felt belts, respectively, to absorb water from said multilayer paper which is in contact with said felt belts, thereby dehydrating said multilayer paper; said apparatus comprising an edge trimming roll mounted to support said multilayer paper after said multilayer paper separates from either of said felt belts, said edge-trimming roll having a pair of grooves at its outer periphery adjacent both ends thereof, said grooves positioned to be located slightl inside of each edge of said multilayer paper, and a pair of water jet nozzles mounted adjacent said edge-trimming roll to provide a water jet therefrom toward the groove slightly on the inside of said edges of the multilayer paper which move in contact with the outside of said grooves, whereby said edges will be cut oif in a straight line by the force of said water jet.

2. An apparatus as claimed in claim 1, wherein said upper and lower rolls are mounted such that said multilayer paper is held between said upper felt belt passing around the outer periphery of said upper roll and said lower felt belt passing around the outer periphery of said lower roll, said edge-trimming roll is mounted such that said multilayer paper is held at a transfer line between said edge-trimming roll and said upper felt belt passing around said upper roll, and said pair of water jet nozzles are mounted above said edge-trimming roll wherein said multilayer paper is separated from said upper roll.

3. An apparatus as claimed in claim 1, further comprising a doctor mounted at the outer periphery of the edge-trimming roll to scrap said multilayer paper from said edge-trimming roll, a pair of doctors fitted into and scraping multilayer paper edges from said grooves, and a receiving vat located below said edge-trimming roll to receive said water and the multilayer paper edges trimmed by said apparatus.

4. An apparatus as claimed in claim 1, wherein said upper felt belt is positioned to be separated from contact with said multilayer paper prior to separation of said lower felt belt therefrom and said lower felt belt is positioned to be separated from said multilayer paper at a point just below said edge-trimming roll.

References Cited UNITED STATES PATENTS 2/ 1934 Smith 162-19SX 5/1968 Clark 162272X US. Cl. X.R. 162-286, 306 

